filter material:
That is, it effectively intercepts the dust particles without forming excessive resistance to the airflow. The interwoven fibers form an infinite number of barriers to the particles, and the wide space between the fibers allows the airflow to pass smoothly.
Efficiency:
The ratio of the amount of dust collected by the filter to the amount of dust of unfiltered air is "filtration efficiency". Particles smaller than 0.1 mm mainly perform diffusion motion, and the larger the particles, the higher the efficiency. Particles larger than 0.5mm mainly perform inertial motion, and the larger the particles, the higher the efficiency.
Resistance:
Fibers circulate airflow, creating tiny drag. The sum of the resistance of countless fibers is the resistance of the filter. The resistance of the filter increases with the increase of the gas flow rate. By increasing the area of the filter material, the relative wind speed of the filter material can be reduced and the filter resistance can be reduced.
Dynamic performance: The trapped dust creates additional resistance to the airflow, so the resistance of the filter in use is gradually increased. The captured dust forms a new obstacle and the filter efficiency is slightly improved. Most of the captured dust accumulates on the windward side of the filter material. The larger the filter material area, the more dust it can hold and the longer the filter life.
Service life:
The more dust on the filter material, the greater the resistance. When the resistance is so large that the design does not allow it, the life of the filter ends. Sometimes too much resistance will cause the dust caught on the filter to scatter. When this secondary pollution occurs, the filter should also be scrapped.
Static electricity:
If the filter material is electrostatic or dusty with static electricity, the filtration effect can be significantly improved. Due to static electricity, the dust changes its trajectory and hits an obstacle, and the electrostatic force participates in the work of sticking.
Filtration Efficiency Among the factors that determine filtration efficiency, the meaning of dust “quantity” is varied, and the calculated and measured filter efficiency values are different. In practical applications, there is the total weight of dust, the number of particles of dust; sometimes the amount of dust for a typical particle size, sometimes the amount of all dust; and the amount of light that is indirectly reflected by a specific method, the amount of fluorescence; The instantaneous amount of a certain state also has a weighted average amount of the efficiency value of the whole process of dusting. Testing the same filter in different ways will result in different efficiency values. Leaving the test method, the efficiency of filtration is impossible to talk about.
Filter resistance:
The filter creates resistance to airflow. The filter is dusty and the resistance increases. When the resistance increases to a certain value, the filter is scrapped. The resistance of the new filter is called "initial resistance"
Final resistance: Its choice is directly related to the service life of the filter, the range of system air volume changes, and system energy consumption. In most cases, the final resistance is 2-4 times the initial resistance.
